ARP

In the Ultra Transcenders books

2V0-13.252V0-15.252V0-18.25NCP-MCI-7.5AZ-802

Each book explains ARP in context, with comparison tables and the common traps.

Terms in this definition

• MAC address

  Media Access Control address: the layer 2 identifier of a NIC, physical or virtual.

• IPv4

  The 32-bit version of IP addressing. It remains the address format you will see most often in log data and threat indicators.

• LSDOU

  The sequence in which Group Policy is processed: the local policy first, followed by site, domain and organisational unit policies. The nearest, last-processed setting takes effect unless Enforced or Block Inheritance alters that.

• segment

  A layer 2 network in NSX for VM connections. Overlay-backed ones carry traffic in tunnels between TEPs; VLAN-backed ones correspond to a physical VLAN.

Related terms

• Advanced iSCSI parameters

  Tunable iSCSI options on an ESX host, including login timeouts and retries, recovery timeout, No-Op values, ARP Redirect and Delayed ACK. They should not be changed unless the storage vendor or support advises it.

• EdgeRouting

  Diagnostic runbook from NSX ODS. Feed it a logical router together with two IP addresses and it checks how healthy Edge routing is, reads the RIB, FIB and ARP entries, and then pings and traces the path.

• proxy ARP

  Replying to ARP queries for addresses owned by a different device. A Tier-0 gateway in NSX gets this switched on automatically whenever NAT rules or load balancer VIPs use addresses from the external interface subnet.

• RARP

  Reverse Address Resolution Protocol. When a MAC address moves, VMware networking floods RARP packets carrying it as their source so physical switches refresh their MAC tables; on switches that carry an HCX-extended network these packets have to be allowed, not filtered.

• RIB

  Table where a router keeps the routes it has learned, used to build the forwarding information base (FIB). The EdgeRouting runbook in NSX ODS examines a logical router's RIB, FIB and ARP entries.